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Bug #12752572 61579: REPLICATION FAILURE WHILE

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INNODB_AUTOINC_LOCK_MODE=1 AND USING TRIGGER

When an insert stmt like "insert into t values (1),(2),(3)" is
executed, the autoincrement values assigned to these three rows are
expected to be contiguous.  In the given lock mode
(innodb_autoinc_lock_mode=1), the auto inc lock will be released
before the end of the statement.  So to make the autoincrement
contiguous for a given statement, we need to reserve the auto inc
values at the beginning of the statement.  

Modified the fix based on review comment by Svoj.
This commit is contained in:
Annamalai Gurusami 2012-05-21 17:25:40 +05:30
parent 781137c0dd
commit e979417c06
1 changed files with 10 additions and 10 deletions
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20
sql/handler.cc
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@ -2398,18 +2398,18 @@ int handler::update_auto_increment()
Note that in prelocked mode no estimation is given.
*/
/*
For multi-row inserts, if the bulk inserts cannot be started, the
handler::estimation_rows_to_insert will not be set. Set it here.
*/
if ((estimation_rows_to_insert == 0) &&
(thd->lex->many_values.elements > 0))
{
estimation_rows_to_insert= thd->lex->many_values.elements;
}
if ((auto_inc_intervals_count == 0) && (estimation_rows_to_insert > 0))
nb_desired_values= estimation_rows_to_insert;
else if ((auto_inc_intervals_count == 0) &&
(thd->lex->many_values.elements > 0))
{
/*
For multi-row inserts, if the bulk inserts cannot be started, the
handler::estimation_rows_to_insert will not be set. But we still
want to reserve the autoinc values.
*/
nb_desired_values= thd->lex->many_values.elements;
}
else /* go with the increasing defaults */
{
/* avoid overflow in formula, with this if() */